<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>cors跨域</title>
</head>

<body>



  <script>
    const xhr = new XMLHttpRequest()
    document.cookie = 'name=abc;path=/'
    xhr.open('put', 'http://localhost:3000/', true)
    xhr.withCredentials = true;
    xhr.setRequestHeader('username', 'aaa')
    xhr.send()
    xhr.onreadystatechange = () => {
      if (xhr.readyState === 4 && xhr.status === 200) {
        console.log(xhr.getResponseHeader('uuuu'))
        console.log(xhr.responseText)
      }
    }
  </script>
</body>

</html>